Boy, they grow up so fast: March 16 will mark the 13th birthday of Sony Online Entertainment’s (SOE) massively multiplayer online role-playing game (MMORG) EverQuest. Sometime during March the business model for the fantasy classic will change from subscription fee to free-to-play, according to EverQuest producer Thom Terrazas.

The potentially risky move of taking DC Universe Online , the massively multiplayer online (MMO) game from Sony Online Entertainment, to a free-to-play model, seems to have paid off, with large increases in revenue being reported .

A million new players have signed up for Sony Online Entertainment’s massively multiplayer online game DC Universe Online following its transition to a free-to-play business model last month, the company said.